Aeroplane chassis



April 28,1931- cfRogA-rELLl 1,803,039

AEROPLANE cHAssIs Filed Aug. L, 1930 subject Patented Apr. 28, 1931 UNITED` STATES CELESTINO ROSATELLI, 0F TURIN, ITALY,

ASSIGNOR TO FIAT SOCIETA ANONIMA,

"0F TURIN, ITALY AEROPLANE CHASSIS Application filed August 1, 1980, Serial No. 472,412, and in Italy June 12, 1930.-

It is known that by the use of brakes on `aeroplane wheels for reducing the distance over which the flying machine rolls on the ground the chassis members are subjected to a stron to the ot er stresses acting thereon may cause breakage of the said structures.

The peculiar chassis shape which is now being generally adopted does not in many cases admit of the use of props for taking up the said torque stress.

It is therefore desirable to provide means for reducing the stresses due to the braking couple and the deformations of the s stem without any increase in size and we ig t.

By this invention a'reaction coupleis generated which acts on the same wheelaxle to a torque stressthrough braking and said reaction couple balances and reduces the resilient deformations and stresses deriving therefrom.

According to this Ainvention the axis of the resilient reaction member (hydraulic, pneumatic or other shock absorber) is suitably arranged onl a diierent plane' spect to that of the wheel axle.' The distance between both' axes, suitably proportional to the weight of the dying machine, generates a torque couple opposing the braking couple.

The arrangement is such that the torque upon the wheel axle will have the same absolute value, whether the wheels be braked or not.

The attachment of the resilient reaction member to the wheel axle is such that the distance between the axes lying on different planes may be adjusted at will according to practical requirements.

The accompanying drawin grammatically a constructiona object of this invention. y

Figure l isaside view of the device.

Figure 2 is a partial lfront view.

Figure 3 is an elevation on an enlarged scale showing a part of the chassis. Y

Figure 4 is a section on line 4 -4 of Fig. 3.

Referrin to the drawing, 10 denotes the fusela e o the aeroplane, to the lower face of which are pivoted to brackets 11 fixed shows diatorque stress which in addition' `vided with a lateral projection somewhat behind the vertical plane passing with re- 'wherein R.L denotes the reaction of the chassis members any substantie form of the. size affecting the about axes to said fuselage by one end the members 12 and 13 of the chassis capable of-'oscillating in a cross direction. Said elements are connected together at their other end, e. g. by welding and the knot 14 thus formed carries the stub axle 15 on which the chassis wheel 16 is mounted. `The elements 12 and 13 stub axle 15 and wheel 16 build up v4one-halt of the chassis, the other half is not/shown for simplicit s sake and is arranged sym metricallywith respect to the longitudinal axis of the fuselage. The knot 14 is pro- 17 placed throu h the axis of the stub axle 15; the iap 1 carries pivotally attached thereto a tie 18 carrying a reaction and shock absorbing device 19 articulated at 20 to a bracket on the wing strut 21.

22 is a brake drum provided on the wheel 16.

Supposing P denotes the vertical reaction of the ground, fthe friction coeiicient, R the wheel. radius, the braking torque .is

Owing to the excentricity of the reaction member 18 a reaction couple is generated having a value Mr=Rd reaction member 18 and d the exoentricity, said couple having a direction opposite to Mt.

It is obvious that by suitab y va the excentricit d, the torque Mt will more or less ba anced.

The excentricity does not im stresses such as would require an increase in weight and streamline of the flying machine.

What I claim is:

1. In an aeroplane the combination with a chassis consistin of members oscillating aral el to the longitudinal axis of the fuseiiige, 'stub' axles carried b said members and wheels pxrovided with rakes and rotatably mounte on said stub axles, of a tie articulated at one ose upon the end to-a part secured to the fuselage and at its other end to a lateral projection of the stub axle support and ,a shock absorber incorporated 1n said tie. l r

12. In an aeroplane the combination withl a fuselage and wing struts, of a chassis comprising two rod couples pivoted at one end to said fuselage so as to osoillate on axes symmetrically arranged with respect to the lollgitudinall axis of the fuselage, the' rods ofeach couple connecting at their opposite v ends so as to form a knot, stub axles carried by said knots, wheels rovided with brakes .and rotatably mounteg on said stub axles and resilient ties articulated at one end to said struts and excentricall at their opposite ends to the correspon ng mots so as to generate a reaction couple for balancing uthe torque stress due to braki In testimony that I claim the foregoing as my invention, have signed m name.

CELESTINO ROSyATELLI. 

